Z390 Pro4 won't turn on
Printed From: ASRock.com
Category: Technical Support
Forum Name: Intel Motherboards
Forum Description: Question about ASRock Intel Motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=11519
Printed Date: 05 Aug 2025 at 2:53am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: Z390 Pro4 won't turn on
Posted By: iris
Subject: Z390 Pro4 won't turn on
Date Posted: 22 May 2019 at 12:32pm
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I've had a completely working build and then I noticed my case fans didn't spin. I'm using the Phanteks Enthoo Pro case with a fan hub which requires a connection to the CPU_FAN header. I was using [URL=https://www.overclock.net/forum/63-other-cooling-discussions/1620824-how-use-pwm-phanteks-enthoo-evolv-atx.html]this thread[/URL] as a reference and thought I'd connect the CPU_FAN-labeled header of the controller to the header labeled PWM_CFG1 on the board. Trying to turn on the computer - nothing moved, fans didn't spin and no sparks or smokes came out. However, ever since that point my computer wouldn't turn on, no matter what I do. I tried resetting the BIOS using the jumper AND removing the battery (not at the same time). Nothing worked. Is there a possible connection to me using the PWM_CFG1 header (which I later learned that it's not a PWM-enabled fan header)? Is there a way I can fix this? Any help would be much appreciated! |
Replies:
Posted By: ASRock_TSD
Date Posted: 24 May 2019 at 10:12am
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Dear Iris, Thank you for choosing ASRock. Regarding to your case, we provide some suggestion to try. 1. Clear CMOS to load BIOS default. Remove the power cord, short the jumper and remove the battery. 2. Only install CPU and one stick memory to check if the system can boot into BIOS. 3. Install the memory at each memory slot to try. Thank you! Yours truly, ASRock TSD |
Posted By: iris
Date Posted: 27 May 2019 at 12:51pm
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Hi, Thank you for your response. I've tried all 3 solutions suggested (even a couple of times each), and the board doesn't turn on at all. No CPU fan spinning and no display output (obviously). I've had experience with more than a couple of builds in the past and this is the first time I feel like there's nothing I can possibly do to solve the problem... How likely is that running voltage on that port could fry the board? I have never witnessed any smoke, spark or anything suspicious going on. Also, visually the board looks perfectly fine. Thanks in advance. |
Posted By: Xaltar
Date Posted: 27 May 2019 at 4:54pm
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Pull the power lead from the PSU and leave the system disconnected from power for an hour. Make sure to hold down the power button for 10 seconds or so after disconnecting power to discharge any residual power. While you have the system disconnected from power put the clear cmos jumper in the clear position and remove the CMOS battery. If after an hour (at least 1 hour) reconnect the system to power and if you still have no activity when pressing the power button then try swapping the power and reset switches on the front panel header of your board. See if using the reset switch as the power button gets the system to power up (this would mean your power switch is faulty/dead). If that also fails try shorting the power pins on the front panel header (where you connect the power switch to the board). When doing all this only have the bare minimum connected to the board, 1 module of RAM, CPU and CPU cooler, no fans, drives or other devices. ------------- 
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Posted By: iris
Date Posted: 26 Jun 2019 at 2:15pm
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Just a quick update: I had this board replaced. I was never told what was the problem so it's forever going to remain a mystery... |